Fix build

Author: vincetse

Dockerfile

@@ -1,14 +1,14 @@
 # Copied from https://github.com/prometheus/client_golang/blob/master/examples/simple/Dockerfile
 
-FROM golang:1.9.2-alpine AS builder
+FROM golang:1.12-alpine AS builder
 WORKDIR /go/src/github.com/infrastructure-as-code/docker-hello-world
 ENV GIN_MODE debug
 COPY Makefile *.go ./
 RUN apk update && \
 	apk upgrade && \
 	apk add \
-		git \
-		make && \
+    alpine-sdk \
+  && \
 	make all
 
 FROM scratch

Makefile

@@ -12,4 +12,4 @@ lint:
 deps:
 	go get -d
 	go get github.com/stretchr/testify
-	go get github.com/golang/lint/golint
+	go get golang.org/x/lint/golint